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Exciting Vorticity Through Higher Order Bessel Beams With a Radial-Line Slot-Array Antenna

Abstract : In this communication, it is shown that a nondiffracting vortex beam (i.e., a higher order Bessel beam with azimuthal phase variation) can be generated in the near field by synthesizing an inward cylindrical traveling-wave distribution over a finite aperture antenna. A radial line slot array (RLSA) is then designed to prove the concept. The collimated vortex beam is excited in the proximity of the RLSA, within a region properly defined by the nondiffracting range of the generated beam. The radial dependence of the longitudinal electric field of the vortex-beam magnitude follows a first-order Bessel function, and its phase presents a linear azimuthal variation. Full-wave results validate the generation of the nondiffractive higher order Bessel beam within the radiative near field of the launcher.
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Davide Comite, Guido Valerio, Matteo Albani, Allessandro Galli, Massimiliano Casaletti, et al.. Exciting Vorticity Through Higher Order Bessel Beams With a Radial-Line Slot-Array Antenna. IEEE Transactions on Antennas and Propagation, 2017, 65 (4), pp.2123 - 2128. ⟨10.1109/TAP.2017.2670503⟩. ⟨hal-01551691⟩

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